chore: add backend ast-grep lint checks

[suyiiyii]

Summary

• add ast-grep to dev dependencies and create repository config for structural Python rules
• add initial backend API rules plus ast-grep rule tests
• integrate ast-grep scan into the unified lint script and PR lint workflow

Verification

• uv run python scripts/lint.py --backend --check-only
• uv run --with ast-grep-cli ast-grep test --config sgconfig.yml --skip-snapshot-tests
• uv run --with ast-grep-cli ast-grep scan --config sgconfig.yml --report-style medium --color never .

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Project	Deployment	Actions	Updated (UTC)
autoglm-gui	Ready	Preview, Comment	Mar 14, 2026 1:27pm

[github-actions]

🚀 Lint & Format Check Results: ✅ PASSED

What was checked:

• 🐍 Backend: Ruff linting + formatting + ast-grep structural rules
• 📱 Frontend: ESLint + Prettier + TypeScript types
• 🔧 Unified: Custom lint script validation

✅ All checks passed!

Your code follows the project's style guidelines.

Checks performed:

• Backend Ruff lint ✅
• Backend Ruff format ✅
• Backend ast-grep ✅
• Frontend ESLint ✅
• Frontend Prettier format ✅
• Frontend TypeScript types ✅
• Unified lint script ✅

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This is an automated check. For questions, ask in the PR discussion.